Lock views in orthographic mode
You can disable automatic switching to perspective from orthographic via preferences:

Menus → Edit → Preferences → Navigation → Orbit &amp; Pan → Auto Perspective (remove tick).

I personally make use of Quad View, which splits the viewport into four regions: Top Orthographic, Front Orthographic, Right Orthographic and User Perspective. Also handy to enable &quot;box&quot; mode so any zoom / pan done in one area is synchronised with the others:

Menus → View → Area → Toggle Quad View
Sidebar → View → Quad View → Box